go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/common/flag/int32.go (about)

     1  // Copyright 2018 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package flag
    16  
    17  import (
    18  	"flag"
    19  	"strconv"
    20  
    21  	"go.chromium.org/luci/common/errors"
    22  )
    23  
    24  // int32Flag is a flag.Getter implementation representing an int32.
    25  type int32Flag int32
    26  
    27  // String returns a string representation of the flag value.
    28  func (f int32Flag) String() string {
    29  	return strconv.FormatInt(int64(f), 10)
    30  }
    31  
    32  // Set records seeing a flag value.
    33  func (f *int32Flag) Set(s string) error {
    34  	i, err := strconv.ParseInt(s, 10, 32)
    35  	if err != nil {
    36  		return errors.Reason("values must be 32-bit integers").Err()
    37  	}
    38  	*f = int32Flag(i)
    39  	return nil
    40  }
    41  
    42  // Get retrieves the flag value.
    43  func (f int32Flag) Get() any {
    44  	return int32(f)
    45  }
    46  
    47  // Int32 returns a flag.Getter which reads flags into the given int32 pointer.
    48  func Int32(i *int32) flag.Getter {
    49  	return (*int32Flag)(i)
    50  }